card. it's all there. speed, acceleration, even brake usage. second by second. on a good day, his card is a record of driving perfection, one his passengers will never see. that's fine with him. his eyes stay fixed on the clock. next stop, hiroshima. the city passed a transport milestone in 2012, 100 years since the first street car went into operation. nhk world's yuki hosaka has been talking to some of the unsung heroes who keep the famous trolleys on track. >> reporter: early morning and hiroshima's street cars start purring out of the shed. the city operates 25 different types of trolleys. they come in all shapes and colors, modern and vintage models.